@angular/core
Version:
Angular - the core framework
138 lines • 17 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { publishDefaultGlobalUtils, publishSignalConfiguration, } from '../application/application_ref';
import { PLATFORM_INITIALIZER } from '../application/application_tokens';
import { InjectionToken, Injector } from '../di';
import { INJECTOR_SCOPE } from '../di/scope';
import { RuntimeError } from '../errors';
import { PLATFORM_DESTROY_LISTENERS, PlatformRef } from './platform_ref';
let _platformInjector = null;
/**
* Internal token to indicate whether having multiple bootstrapped platform should be allowed (only
* one bootstrapped platform is allowed by default). This token helps to support SSR scenarios.
*/
export const ALLOW_MULTIPLE_PLATFORMS = new InjectionToken(ngDevMode ? 'AllowMultipleToken' : '');
/**
* Creates a platform.
* Platforms must be created on launch using this function.
*
* @publicApi
*/
export function createPlatform(injector) {
if (_platformInjector && !_platformInjector.get(ALLOW_MULTIPLE_PLATFORMS, false)) {
throw new RuntimeError(400 /* RuntimeErrorCode.MULTIPLE_PLATFORMS */, ngDevMode && 'There can be only one platform. Destroy the previous one to create a new one.');
}
publishDefaultGlobalUtils();
publishSignalConfiguration();
_platformInjector = injector;
const platform = injector.get(PlatformRef);
runPlatformInitializers(injector);
return platform;
}
/**
* Creates a factory for a platform. Can be used to provide or override `Providers` specific to
* your application's runtime needs, such as `PLATFORM_INITIALIZER` and `PLATFORM_ID`.
* @param parentPlatformFactory Another platform factory to modify. Allows you to compose factories
* to build up configurations that might be required by different libraries or parts of the
* application.
* @param name Identifies the new platform factory.
* @param providers A set of dependency providers for platforms created with the new factory.
*
* @publicApi
*/
export function createPlatformFactory(parentPlatformFactory, name, providers = []) {
const desc = `Platform: ${name}`;
const marker = new InjectionToken(desc);
return (extraProviders = []) => {
let platform = getPlatform();
if (!platform || platform.injector.get(ALLOW_MULTIPLE_PLATFORMS, false)) {
const platformProviders = [
...providers,
...extraProviders,
{ provide: marker, useValue: true },
];
if (parentPlatformFactory) {
parentPlatformFactory(platformProviders);
}
else {
createPlatform(createPlatformInjector(platformProviders, desc));
}
}
return assertPlatform(marker);
};
}
/**
* Helper function to create an instance of a platform injector (that maintains the 'platform'
* scope).
*/
function createPlatformInjector(providers = [], name) {
return Injector.create({
name,
providers: [
{ provide: INJECTOR_SCOPE, useValue: 'platform' },
{ provide: PLATFORM_DESTROY_LISTENERS, useValue: new Set([() => (_platformInjector = null)]) },
...providers,
],
});
}
/**
* Checks that there is currently a platform that contains the given token as a provider.
*
* @publicApi
*/
export function assertPlatform(requiredToken) {
const platform = getPlatform();
if (!platform) {
throw new RuntimeError(401 /* RuntimeErrorCode.PLATFORM_NOT_FOUND */, ngDevMode && 'No platform exists!');
}
if ((typeof ngDevMode === 'undefined' || ngDevMode) &&
!platform.injector.get(requiredToken, null)) {
throw new RuntimeError(400 /* RuntimeErrorCode.MULTIPLE_PLATFORMS */, 'A platform with a different configuration has been created. Please destroy it first.');
}
return platform;
}
/**
* Returns the current platform.
*
* @publicApi
*/
export function getPlatform() {
return _platformInjector?.get(PlatformRef) ?? null;
}
/**
* Destroys the current Angular platform and all Angular applications on the page.
* Destroys all modules and listeners registered with the platform.
*
* @publicApi
*/
export function destroyPlatform() {
getPlatform()?.destroy();
}
/**
* The goal of this function is to bootstrap a platform injector,
* but avoid referencing `PlatformRef` class.
* This function is needed for bootstrapping a Standalone Component.
*/
export function createOrReusePlatformInjector(providers = []) {
// If a platform injector already exists, it means that the platform
// is already bootstrapped and no additional actions are required.
if (_platformInjector)
return _platformInjector;
publishDefaultGlobalUtils();
// Otherwise, setup a new platform injector and run platform initializers.
const injector = createPlatformInjector(providers);
_platformInjector = injector;
publishSignalConfiguration();
runPlatformInitializers(injector);
return injector;
}
function runPlatformInitializers(injector) {
const inits = injector.get(PLATFORM_INITIALIZER, null);
inits?.forEach((init) => init());
}
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This token helps to support SSR scenarios.\n */\nexport const ALLOW_MULTIPLE_PLATFORMS = new InjectionToken<boolean>(\n  ngDevMode ? 'AllowMultipleToken' : '',\n);\n\n/**\n * Creates a platform.\n * Platforms must be created on launch using this function.\n *\n * @publicApi\n */\nexport function createPlatform(injector: Injector): PlatformRef {\n  if (_platformInjector && !_platformInjector.get(ALLOW_MULTIPLE_PLATFORMS, false)) {\n    throw new RuntimeError(\n      RuntimeErrorCode.MULTIPLE_PLATFORMS,\n      ngDevMode && 'There can be only one platform. Destroy the previous one to create a new one.',\n    );\n  }\n  publishDefaultGlobalUtils();\n  publishSignalConfiguration();\n  _platformInjector = injector;\n  const platform = injector.get(PlatformRef);\n  runPlatformInitializers(injector);\n  return platform;\n}\n\n/**\n * Creates a factory for a platform. Can be used to provide or override `Providers` specific to\n * your application's runtime needs, such as `PLATFORM_INITIALIZER` and `PLATFORM_ID`.\n * @param parentPlatformFactory Another platform factory to modify. Allows you to compose factories\n * to build up configurations that might be required by different libraries or parts of the\n * application.\n * @param name Identifies the new platform factory.\n * @param providers A set of dependency providers for platforms created with the new factory.\n *\n * @publicApi\n */\nexport function createPlatformFactory(\n  parentPlatformFactory: ((extraProviders?: StaticProvider[]) => PlatformRef) | null,\n  name: string,\n  providers: StaticProvider[] = [],\n): (extraProviders?: StaticProvider[]) => PlatformRef {\n  const desc = `Platform: ${name}`;\n  const marker = new InjectionToken(desc);\n  return (extraProviders: StaticProvider[] = []) => {\n    let platform = getPlatform();\n    if (!platform || platform.injector.get(ALLOW_MULTIPLE_PLATFORMS, false)) {\n      const platformProviders: StaticProvider[] = [\n        ...providers,\n        ...extraProviders,\n        {provide: marker, useValue: true},\n      ];\n      if (parentPlatformFactory) {\n        parentPlatformFactory(platformProviders);\n      } else {\n        createPlatform(createPlatformInjector(platformProviders, desc));\n      }\n    }\n    return assertPlatform(marker);\n  };\n}\n\n/**\n * Helper function to create an instance of a platform injector (that maintains the 'platform'\n * scope).\n */\nfunction createPlatformInjector(providers: StaticProvider[] = [], name?: string): Injector {\n  return Injector.create({\n    name,\n    providers: [\n      {provide: INJECTOR_SCOPE, useValue: 'platform'},\n      {provide: PLATFORM_DESTROY_LISTENERS, useValue: new Set([() => (_platformInjector = null)])},\n      ...providers,\n    ],\n  });\n}\n\n/**\n * Checks that there is currently a platform that contains the given token as a provider.\n *\n * @publicApi\n */\nexport function assertPlatform(requiredToken: any): PlatformRef {\n  const platform = getPlatform();\n\n  if (!platform) {\n    throw new RuntimeError(RuntimeErrorCode.PLATFORM_NOT_FOUND, ngDevMode && 'No platform exists!');\n  }\n\n  if (\n    (typeof ngDevMode === 'undefined' || ngDevMode) &&\n    !platform.injector.get(requiredToken, null)\n  ) {\n    throw new RuntimeError(\n      RuntimeErrorCode.MULTIPLE_PLATFORMS,\n      'A platform with a different configuration has been created. Please destroy it first.',\n    );\n  }\n\n  return platform;\n}\n\n/**\n * Returns the current platform.\n *\n * @publicApi\n */\nexport function getPlatform(): PlatformRef | null {\n  return _platformInjector?.get(PlatformRef) ?? null;\n}\n\n/**\n * Destroys the current Angular platform and all Angular applications on the page.\n * Destroys all modules and listeners registered with the platform.\n *\n * @publicApi\n */\nexport function destroyPlatform(): void {\n  getPlatform()?.destroy();\n}\n\n/**\n * The goal of this function is to bootstrap a platform injector,\n * but avoid referencing `PlatformRef` class.\n * This function is needed for bootstrapping a Standalone Component.\n */\nexport function createOrReusePlatformInjector(providers: StaticProvider[] = []): Injector {\n  // If a platform injector already exists, it means that the platform\n  // is already bootstrapped and no additional actions are required.\n  if (_platformInjector) return _platformInjector;\n\n  publishDefaultGlobalUtils();\n  // Otherwise, setup a new platform injector and run platform initializers.\n  const injector = createPlatformInjector(providers);\n  _platformInjector = injector;\n  publishSignalConfiguration();\n  runPlatformInitializers(injector);\n  return injector;\n}\n\nfunction runPlatformInitializers(injector: Injector): void {\n  const inits = injector.get(PLATFORM_INITIALIZER, null);\n  inits?.forEach((init) => init());\n}\n"]}